NEET BIOLOGY

Detailed explanation-1: -Porocytes are narrow and elongated cells that connect the outside of the sponge to the inside cavity. These pores are sometimes also referred to as ostia, and they provide openings for water, which carries planktonic food and oxygen, to enter the sponge body (Fig. 3.19).

Detailed explanation-2: -Sponges are perforated by many tiny pores called ostia that permit water to enter one or more oscula (singular osculum) that let the water exit. These openings are connected by a series of canals, some of which are lined by collar cells called choanocytes whose flagella maintain a flow of water through the sponge.

Detailed explanation-3: -Sponges. Usually found in the sea, sponges are some of the world’s simplest animals. They have no heads, eyes, tails, or mouths, and they live most of their lives rooted in one spot. Their bodies are full of tiny holes called pores.

Detailed explanation-4: -However, a sponge (an, is, finds) the simplest form of a multicellular (for, animal, pores). Most sponges live in the oceans (tiny, of, or) the world. A few sponges live (not, move, in) fresh water.

Detailed explanation-5: -Sea sponges are one of the world’s simplest multi-cellular living organisms. Yes, sea sponges are considered animals not plants. But they grow, reproduce and survive much as plants do. They have no central nervous system, digestive system or circulatory system – and no organs!